Re:YouTube video has its own URL in it
by jakear on Tuesday July 16, 2019 @02:24PM
(#20452561)
I believe that’s just part of the joke. It’s a mock email from the future, telling him what the URL will be and how to make the video.
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In another comment, someone says the trick here is to do a resumable upload.
The document is covering the sign at the start of the video, so the uploader could have uploaded that section (without any text on the sign in-game), then "resumed" the upload with a different video that contains the URL on the sign and starts after he switches to the Minecraft window.